Sectional incandescent lamp.



No. 860,627. PAtLNTLD JULY 23, 1907. G. E. BILL L A. D. RLDMAN, SR.

SEGTIONAL INGANDBSGENTILAMP. APPLIGATION FILED JAN. ao. 190e.

' /M A fr0/w15 Ys A`UNI'IID STATES 4PA'IE1\ OFFICE.

GEORGE EDWIN BlLL AND ALBERT DEWEEZE REDMAN, SR., OF HARRISBURG, lbENNSYLVANIA.

SECTIONAL INCANDESCENT LAMP.

Application led January 30, 1906.

Specification of Letters Patent.

'candcscent lamps and has for its object to provide means for varying the intensity oi the light by the nnwenient ol the controller.

-A V,further object of the invention is to provide an incandescent lamp having a plurality of filaments adapted to bevsuccessively thrownhinto circuit to pro' l once lights of different candle power.

A further object is to provide a. plurality of spring c: ntact fingers Inovable'to operative position through th lnediuin ol' a disk or plate, the latter being provided wi l a eauiface having aseriesofspaced recesses or:

bility ai' well as to reduce the cost of manufacture,

Further objects and advantages will appear in the folhnviug description, it'loeing understood that various changes i'i form, proportions and general assemblage ol' parts may be resorted to Within the scope o the appended claims.

1n the accompanying drawings forming a part of this specification z--Figure 1 is a side elevation partly in section ol' an incandescent lamp provided with a socket cmitroller or regulator constructed in accordance with our invention. Fig. 2 is a transverse sectional view taken on the lint` 2-2 oi Fig. l. 3 a detail sectional view showing in elevation the operating cam or disk in position to engage the contact lingers. Fig. 4 is a similar view showing one of the Contact fingers locked in circuit closing position. Fig. 5 is a side elevation partly in section illustrating a modified form of the invention. Fig. (i is ya transverse sectional view taken on the line fis-(l of Fig. i

Similar numerals of reference indicate corresponding parts in all the figures of the drawings.

The device consists of a vacuum globe or bulb 5 depending from a metal cap G and secured in position oy a-plug or matrix of plaster-of-paris, porcelain or other suitable insulating material 7. Disposed within the bulb 5 are a'plurality of filaments S each connected by a conductor 9'to a stationary Contact 10 embedded in the plug 7, one of the wires 9 being soldered or otherwise secured to the metal cap G, as shown at 11.r

Rigidly Secured to the plug 7 is one end of a rod or Fig.

Patented July 23, 1907.

Serial No. 298,659.

pin 12 the opposite end of which is free to revolve in a tubular casing or sleeve 13 secured toand depending ironia mating cap f4, the latter being provided with a lug or projection 15 adapted to engage a segmental slot or groove 17 in the cap 6 whereby the caps are locked against accidental displacement.

The cap .14 is formed with terminal threads 1S adapted to' engage the corrrspondingI threads 19 oi an ordinary incandescent lainp socket 20 so that the de-v vice niay be` conveniently connected in a lighting circuit, one terminal of the circuit being connected to the ea p 14 and the opposite termiunl'to lhcmetal casing or sleeve 13.

Secured to the rod 12 are a plurality of laterally extending spring contact fingers 21 adapted to engage `the contacts 10 and thereby close the circuit through any one of the filaments 8 so as to produce lights of different candle power.

The contact fingers are moved to operative position through thelnedium of a plate or disk 22 secured to or formed integral with the sleeve 13` and provided with Aa cani face ZBadaptedto successively engage and depress the lingers when either thecap 6 or the cap 14 is partially rotated. v The activeface oivthe operating earn is formed with a seriesoispaced notchesor recesses 24 adapted to receive the contact fingers when the latter are moved to operative position and thereby lock said fingers in positive contact with the terminals of the filaments.

When it is desired to vary the intensity of the light, the bulb is grasped in the hand and partially rotated which causes the cap G, carrying the rod 12 and fingers 21, to also rotate. As the lingers 21 come in contact with the earn face 23 of the plate 22 they are successively depressed or moved to' operative position in engagement with the adjacent contacts 10 and in which position they will enter the peripheral notches or recesses 24 so as to effectually lock said contact fingers against accidental rotation. It will thus he seen that when the plate 22 is rotated so as to cause the first spring finger to engage the adjacent contact 10 the currentwill flow through the sleeve 13 and plate 22 to said Contact and thence through the bank or' loops or filaments 8 to the contact 'l1 and off to the line. When the plate 22`is again rotated the latter will engage and depress the second sprinjir finger thereby cutting onf the first loop or filament and so on throughout the entire series of contacts. will be readily underslood. li' desired, however7 the bulb may be held stationary and ythe cap 11i revolved7 the result accomplished heing the same in both instances.

' 5 and (i there is illustrated a modified form of the invention in which the contact fingers 2l are.

normally held in` engager-nent with the contacts 10" -contacts connected to and successively elevated or moved to inoperative position to cnt outany particular filament by means of a spit-.illy disposed operating member secured to the sleeve 13 and having its tree end deliected at 26 and disposed in the path of movement of the contact iingers. In this form ot' the device as the lingers are snccessively elevated and held in inoperative position by engagement with the lower convolution of the operating member, as shown.

Having thus described the invention, what is claimed, isz- 1. A 'lamp having a plurality ot til'aments` stationary contacts connected to the tilaments. movable contact members adapted to engage the stationary contacts, and means lor locking the movable contacts in circuit closing position.

I. A lalnp having a plurality of tilaments. stationary contacts-connected to the tilaments. movable contact members adapted to engage the stationary contacts and an operating cam for locking the movable contacts in circuit closingy position.

4. A lamp having a plurality of tilaments. stationary contacts connected to tbe tilaments. yieldable contact members adapted to engage the stationary contacts. and an operating cam lor depressingr the movable contacts and locking the same in circuit closing.:r position.

A lamp having a plurality of lilaments. stationary the lilaments. vieldable contact members adapted` to engage the stationary contacts. and an operating cam for depressing the yieldable contacts. said cam having a plurality of spaced recesses formed in its active face for the reception of the yieldable contacts thereby to lock the same in circuit closing position.

(i, A lamp having a cap and provided with a plurality ol lilainents. stationary contacts connected to the lilamenis. a rod carried by the cap and provided with radiating movable contact members adapted to engage the stationary contacts. and means carried by the rod for locking' the movable contacts in current closing position,

T. A lamp having a sectional cap and provided with a plurality ot' tilaments, stationary contacts connected to the lilamcnts. a rod secured to one of the cap sections and provided with yieldable contact members adapted to engage the stationary contacts and means carried by the opposite cap section for depr ing the movable contacts.

R. A lamp having .1 sectional cap and provided with a plurality of. tllaments. stationary contacts connected to the lilamenls. a sleeve carried-by one ol' the cap sections. a rod secured to the opposite cap sections and seated in said sleeve, yeldahle Contact members carried by the rod and adapted to en uage the stationary contacts. and an operating cam carried by the sleeve for depressing theA movable contacts and locking the same in circuit closing position. .i. A lamp having a sectional ap and providcd'nith .i plurality of lilaments. stationary contacts connected to the tilaments. a sleeve c. 'lied by one ot the cap sections. a rod secured to the opposite section and seated in the sleeve. a plurality of spring contact lingers carried by the rod and adapted to engage tbe stationary contacts, and an operating cam secured to the sleeve for successively depressingl the contact lingers.

lo. A lamp having a cap formed of a plurality of scc tions mounted [or rotation and having interengnglng parts. a plurality of lilaments. stationary contacts connected to the lilaments. a sleeve carried by one of the cap sections. a rod "atried by the opposite cap sections-and mounted lor rotation in the sleeve. a plurality of spring contact tingers secured to and movable with the rod for engagement u'ith the stationary contacts. and a plate secured to tbc sleeve and having a cam sul 'e adapted lo depress the lingers in engagement with the stationary contacts. said cam surface being provided with spaced recesses for Boeking the lingers in circuit closing positions.

in testimony that \\e claim the loregoing as our own. we have hereto alllxed our signatures in the presence of t\vo witnesses.

. GEORGE EDWIN Illlill.

ALBERT DEWEI'IZE RICDMAN. SR.

Witnesses z Jost: lnsrnmn BILL,

ALtncn'r Di-:wnnzt: REDMAN. Jr. 

